Simulation-based Investigation Of The Anisotropic Shrinkage Behaviour In Sinter-based Additive Manufacturing Using A Periodic Green Part Porosity

In sinter-based additive manufacturing (SBAM), as with other sinter-based manufacturing processes, a green compact is first produced, which is then sintered to obtain a dense part. During the sintering process, shrinkage occurs due to compaction. Due to the layer-by-layer production of the green parts at SBAM, this shrinkage is anisotropic. Taking this anisotropic behaviour into account is one of the biggest challenges in the simulative prediction of sintering distortion, which provides a good tool to compensate for it. In the current state of research anisotropy coefficients are used to predict the anisotropic behaviour considering a homogeneous green part density. In this work, however, the anisotropic shrinkage behaviour is numerically investigated on the basis of an isotropic material behaviour considering a periodic density distribution in the green part. Based on the results obtained in this work, it can be shown that anisotropic behaviour is caused by the green part denisty distribution.